<script lang="ts" setup>
import type {
  UploadFile,
  UploadProgressEvent,
  UploadRequestOptions,
} from 'element-plus';

import type { AxiosResponse } from '@vben/request';

import type { UploadListType } from './typing';

import type { AxiosProgressEvent } from '#/api/infra/file';

import { ref, toRefs, watch } from 'vue';

import { CloudUpload } from '@vben/icons';
import { $t } from '@vben/locales';
import { isFunction, isObject, isString } from '@vben/utils';

import { ElMessage, ElUpload } from 'element-plus';

import { checkImgType, defaultImageAccepts } from './helper';
import { UploadResultStatus } from './typing';
import { useUpload, useUploadType } from './use-upload';

defineOptions({ name: 'ImageUpload', inheritAttrs: false });

const props = withDefaults(
  defineProps<{
    // 根据后缀，或者其他
    accept?: string[];
    api?: (
      file: File,
      onUploadProgress?: AxiosProgressEvent,
    ) => Promise<AxiosResponse<any>>;
    // 上传的目录
    directory?: string;
    disabled?: boolean;
    helpText?: string;
    listType?: UploadListType;
    // 最大数量的文件，Infinity不限制
    maxNumber?: number;
    // 文件最大多少MB
    maxSize?: number;
    // 是否支持多选
    multiple?: boolean;
    // support xxx.xxx.xx
    resultField?: string;
    // 是否显示下面的描述
    showDescription?: boolean;
    value?: string | string[];
  }>(),
  {
    value: () => [],
    directory: undefined,
    disabled: false,
    listType: 'picture-card',
    helpText: '',
    maxSize: 2,
    maxNumber: 1,
    accept: () => defaultImageAccepts,
    multiple: false,
    api: undefined,
    resultField: '',
    showDescription: true,
  },
);

const emit = defineEmits(['change', 'update:value', 'delete']);
const { accept, helpText, maxNumber, maxSize } = toRefs(props);
const isInnerOperate = ref<boolean>(false);
const { getStringAccept } = useUploadType({
  acceptRef: accept,
  helpTextRef: helpText,
  maxNumberRef: maxNumber,
  maxSizeRef: maxSize,
});

const fileList = ref<UploadFile[]>([]);
const isLtMsg = ref<boolean>(true); // 文件大小错误提示
const isActMsg = ref<boolean>(true); // 文件类型错误提示
const isFirstRender = ref<boolean>(true); // 是否第一次渲染

watch(
  () => props.value,
  async (v) => {
    if (isInnerOperate.value) {
      isInnerOperate.value = false;
      return;
    }
    let value: string | string[] = [];
    if (v) {
      if (Array.isArray(v)) {
        value = v;
      } else {
        value.push(v);
      }
      fileList.value = value
        .map((item, i) => {
          if (item && isString(item)) {
            return {
              uid: -i,
              name: item.slice(Math.max(0, item.lastIndexOf('/') + 1)),
              status: UploadResultStatus.DONE,
              url: item,
            } as UploadFile;
          } else if (item && isObject(item)) {
            const file = item as Record<string, any>;
            return {
              uid: file.uid || -i,
              name: file.name || '',
              status: UploadResultStatus.DONE,
              url: file.url,
            } as UploadFile;
          }
          return null;
        })
        .filter(Boolean) as UploadFile[];
    }
    if (!isFirstRender.value) {
      emit('change', value);
      isFirstRender.value = false;
    }
  },
  {
    immediate: true,
    deep: true,
  },
);

function getBase64<T extends ArrayBuffer | null | string>(file: File) {
  return new Promise<T>((resolve, reject) => {
    const reader = new FileReader();
    reader.readAsDataURL(file);
    reader.addEventListener('load', () => {
      resolve(reader.result as T);
    });
    reader.addEventListener('error', (error) => reject(error));
  });
}

const handlePreview = async (file: UploadFile) => {
  if (!file.url) {
    const preview = await getBase64<string>(file.raw!);
    window.open(preview || '');
    return;
  }
  window.open(file.url);
};

const handleRemove = async (file: UploadFile) => {
  if (fileList.value) {
    const index = fileList.value.findIndex((item) => item.uid === file.uid);
    index !== -1 && fileList.value.splice(index, 1);
    const value = getValue();
    isInnerOperate.value = true;
    emit('update:value', value);
    emit('change', value);
    emit('delete', file);
  }
};

const beforeUpload = async (file: File) => {
  const { maxSize, accept } = props;
  const isAct = checkImgType(file, accept);
  if (!isAct) {
    ElMessage.error($t('ui.upload.acceptUpload', [accept]));
    isActMsg.value = false;
    // 防止弹出多个错误提示
    setTimeout(() => (isActMsg.value = true), 1000);
    return false;
  }
  const isLt = file.size / 1024 / 1024 > maxSize;
  if (isLt) {
    ElMessage.error($t('ui.upload.maxSizeMultiple', [maxSize]));
    isLtMsg.value = false;
    // 防止弹出多个错误提示
    setTimeout(() => (isLtMsg.value = true), 1000);
    return false;
  }
  return true;
};

async function customRequest(options: UploadRequestOptions) {
  let { api } = props;
  if (!api || !isFunction(api)) {
    api = useUpload(props.directory).httpRequest;
  }
  try {
    // 上传文件
    const progressEvent: AxiosProgressEvent = (e) => {
      const percent = Math.trunc((e.loaded / e.total!) * 100);
      options.onProgress!({
        percent,
        total: e.total || 0,
        loaded: e.loaded || 0,
        lengthComputable: true,
      } as unknown as UploadProgressEvent);
    };
    const res = await api?.(options.file, progressEvent);
    options.onSuccess!(res);
    ElMessage.success($t('ui.upload.uploadSuccess'));

    // 更新文件
    const value = getValue();
    isInnerOperate.value = true;
    emit('update:value', value);
    emit('change', value);
  } catch (error: any) {
    console.error(error);
    options.onError!(error);
  }
}

function getValue() {
  const list = (fileList.value || [])
    .filter((item) => item?.status === UploadResultStatus.DONE)
    .map((item: any) => {
      if (item?.response && props?.resultField) {
        return item?.response;
      }
      return item?.url || item?.response?.url || item?.response;
    });
  // add by 芋艿：【特殊】单个文件的情况，获取首个元素，保证返回的是 String 类型
  if (props.maxNumber === 1) {
    return list.length > 0 ? list[0] : '';
  }
  return list;
}
</script>

<template>
  <div>
    <ElUpload
      v-bind="$attrs"
      v-model:file-list="fileList"
      :accept="getStringAccept"
      :before-upload="beforeUpload"
      :http-request="customRequest"
      :disabled="disabled"
      :list-type="listType"
      :limit="maxNumber"
      :multiple="multiple"
      :on-preview="handlePreview"
      :on-remove="handleRemove"
    >
      <div
        v-if="fileList && fileList.length < maxNumber"
        class="flex flex-col items-center justify-center"
      >
        <CloudUpload />
        <div class="mt-2">{{ $t('ui.upload.imgUpload') }}</div>
      </div>
    </ElUpload>
    <div v-if="showDescription" class="mt-2 text-xs text-gray-500">
      {{ getStringAccept }}
    </div>
  </div>
</template>

<style>
.ant-upload-select-picture-card {
  @apply flex items-center justify-center;
}
</style>
